<template>
  <div>
    <div>
      <el-switch
        v-model="draggable"
        active-text="开启拖拽"
        inactive-text="关闭拖拽"
      ></el-switch>
      <el-button
        v-if="draggable"
        @click="batchSave"
      >批量保存</el-button>&nbsp;&nbsp;&nbsp;
      <el-button
        type="danger"
        @click="batchDelete"
      >批量删除</el-button><br /><br />
      <el-form
        :inline="true"
        :model="dataForm"
        @keyup.enter.native="addLevelOneCategory()"
      >
        <el-form-item>
          <el-input
            v-model="dataForm.key"
            placeholder="一级分类名"
            clearable
          ></el-input>
        </el-form-item>
        <el-form-item>
          <el-button
            @click="addLevelOneCategory()"
            type="primary"
          >新增</el-button>
        </el-form-item>
      </el-form>
    </div>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      show-checkbox
      node-key="id"
      :default-expanded-keys="expandedKey"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
    >
      <span
        class="custom-tree-node"
        slot-scope="{ node, data }"
      >
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level <=1"
            type="text"
            size="mini"
            @click="() => append(data)"
          ><i class="el-icon-circle-plus">追加</i>
          </el-button>
          <el-button
            type="text"
            size="mini"
            @click="edit(data)"
          > <i class="el-icon-circle-edit">编辑</i></el-button>
          <el-button
            v-if="node.childNodes.length==0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          > <i class="el-icon-delete-solid">删除</i></el-button>
        </span>
      </span>
    </el-tree>

    <el-dialog
      :title="title"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false"
    >
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input
            v-model="category.name"
            autocomplete="off"
          ></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input
            v-model="category.icon"
            autocomplete="off"
          ></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input
            v-model="category.productUnit"
            autocomplete="off"
          ></el-input>
        </el-form-item>
      </el-form>
      <span
        slot="footer"
        class="dialog-footer"
      >
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button
          type="primary"
          @click="submitData"
        >确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  // import引入的组件需要注入到对象中才能使用
  components: {},
  props: {},
  data () {
    return {
      dataForm: {
        key: ''
      },
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      title: '',
      dialogType: '', // edit,add
      category: {
        name: '',
        parentId: 0,
        catLevel: 0,
        isShow: true,
        sort: 0,
        productUnit: '',
        icon: '',
        id: null
      },
      dialogVisible: false,
      menus: [],
      expandedKey: [],
      defaultProps: {
        children: 'childCategory',
        label: 'name'
      }
    }
  },
  // 监控data中的数据变化
  watch: {},
  // 方法集合
  methods: {
    getMenus () {
      this.$http({
        url: this.$http.adornUrl('/product/category/list/tree'),
        method: 'get'
      }).then(({ data }) => {
        console.log('成功获取到菜单数据...', data.data)
        this.menus = data.data
      })
    },
    batchDelete () {
      let ids = []
      let checkedNodes = this.$refs.menuTree.getCheckedNodes()
      console.log('被选中的元素', checkedNodes)
      for (let i = 0; i < checkedNodes.length; i++) {
        ids.push(checkedNodes[i].id)
      }
      this.$confirm(`是否批量删除【${ids}】菜单?`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl('/product/category/delete'),
            method: 'post',
            data: this.$http.adornData(ids, false)
          }).then(({ data }) => {
            this.$message({
              message: '菜单批量删除成功',
              type: 'success'
            })
            this.getMenus()
          })
        })
        .catch(() => {})
    },
    batchSave () {
      this.$http({
        url: this.$http.adornUrl('/product/category/update/sort'),
        method: 'post',
        data: this.$http.adornData(this.updateNodes, false)
      }).then(({ data }) => {
        this.$message({
          message: '菜单顺序等修改成功',
          type: 'success'
        })
        // 刷新出新的菜单
        this.getMenus()
        // 设置需要默认展开的菜单
        this.expandedKey = this.pCid
        this.updateNodes = []
        this.maxLevel = 0
        // this.pCid = 0;
      })
    },
    handleDrop (draggingNode, dropNode, dropType, ev) {
      console.log('handleDrop: ', draggingNode, dropNode, dropType)
      // 1、当前节点最新的父节点id
      let pCid = 0
      let siblings = null
      if (dropType === 'before' || dropType === 'after') {
        pCid =
          dropNode.parent.data.id === undefined
            ? 0
            : dropNode.parent.data.id
        siblings = dropNode.parent.childNodes
      } else {
        pCid = dropNode.data.id
        siblings = dropNode.childNodes
      }
      this.pCid.push(pCid)

      // 2、当前拖拽节点的最新顺序，
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.id === draggingNode.data.id) {
          // 如果遍历的是当前正在拖拽的节点
          let catLevel = draggingNode.level
          if (siblings[i].level !== draggingNode.level) {
            // 当前节点的层级发生变化
            catLevel = siblings[i].level
            // 修改他子节点的层级
            this.updateChildNodeLevel(siblings[i])
          }
          this.updateNodes.push({
            id: siblings[i].data.id,
            sort: i,
            parentId: pCid,
            catLevel: catLevel
          })
        } else {
          this.updateNodes.push({ id: siblings[i].data.id, sort: i })
        }
      }

      // 3、当前拖拽节点的最新层级
      console.log('updateNodes', this.updateNodes)
    },
    updateChildNodeLevel (node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data
          this.updateNodes.push({
            id: cNode.id,
            catLevel: node.childNodes[i].level
          })
          this.updateChildNodeLevel(node.childNodes[i])
        }
      }
    },
    allowDrop (draggingNode, dropNode, type) {
      // 1、被拖动的当前节点以及所在的父节点总层数不能大于3

      // 1）、被拖动的当前节点总层数
      console.log('allowDrop:', draggingNode, dropNode, type)
      //
      this.countNodeLevel(draggingNode)
      // 当前正在拖动的节点+父节点所在的深度不大于3即可
      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1
      console.log('深度：', deep)

      //   this.maxLevel
      if (type === 'inner') {
        // console.log(
        //   `this.maxLevel：${this.maxLevel}；draggingNode.data.catLevel：${draggingNode.data.catLevel}；dropNode.level：${dropNode.level}`
        // );
        return deep + dropNode.level <= 3
      } else {
        return deep + dropNode.parent.level <= 3
      }
    },
    countNodeLevel (node) {
      // 找到所有子节点，求出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level
          }
          this.countNodeLevel(node.childNodes[i])
        }
      }
    },
    edit (data) {
      console.log('要修改的数据', data)
      this.dialogType = 'edit'
      this.title = '修改分类'
      this.dialogVisible = true
      // 发送请求获取当前节点最新的数据
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.id}`),
        method: 'get'
      }).then(({ data }) => {
        // 请求成功
        console.log('要回显的数据', data)
        this.category.name = data.category.name
        this.category.id = data.category.id
        this.category.icon = data.category.icon
        this.category.productUnit = data.category.productUnit
        this.category.parentId = data.category.parentId
        this.category.catLevel = data.category.catLevel
        this.category.sort = data.category.sort
        this.category.isShow = data.category.isShow
      })
    },
    append (data) {
      this.dialogType = 'add'
      this.title = '添加分类'
      this.dialogVisible = true
      this.category.parentId = data.id
      this.category.catLevel = data.catLevel * 1 + 1
      this.category.id = null
      this.category.name = ''
      this.category.icon = ''
      this.category.productUnit = ''
      this.category.sort = 0
    },

    submitData () {
      if (this.dialogType === 'add') {
        this.addCategory()
      }
      if (this.dialogType === 'edit') {
        this.editCategory()
      }
    },
    // 修改三级分类数据
    editCategory () {
      var { id, name, icon, productUnit } = this.category
      this.$http({
        url: this.$http.adornUrl('/product/category/update'),
        method: 'post',
        data: this.$http.adornData({ id, name, icon, productUnit }, false)
      }).then(({ data }) => {
        this.$message({
          message: '菜单修改成功',
          type: 'success'
        })
        // 关闭对话框
        this.dialogVisible = false
        // 刷新出新的菜单
        this.getMenus()
        // 设置需要默认展开的菜单
        this.expandedKey = [this.category.parentId]
      })
    },
    // 添加一级分类
    addLevelOneCategory () {
      if (this.dataForm.key !== null && this.dataForm.key !== '') {
        this.category.parentId = 0
        this.category.catLevel = 1
        this.category.id = null
        this.category.name = this.dataForm.key
        this.category.icon = ''
        this.category.productUnit = ''
        this.category.sort = 0
        this.$http({
          url: this.$http.adornUrl('/product/category/save'),
          method: 'post',
          data: this.$http.adornData(this.category, false)
        }).then(({ data }) => {
          this.$message({
            message: '菜单保存成功',
            type: 'success'
          })
         // 刷新出新的菜单
          this.getMenus()
        })
      } else {
        this.$message({
          type: 'warning',
          message: '请填写分类名'
        })
      }
    },
    // 添加二级分类
    addCategory () {
      console.log('提交的二级分类数据', this.category)
      this.$http({
        url: this.$http.adornUrl('/product/category/save'),
        method: 'post',
        data: this.$http.adornData(this.category, false)
      }).then(({ data }) => {
        this.$message({
          message: '菜单保存成功',
          type: 'success'
        })
        // 关闭对话框
        this.dialogVisible = false
        // 刷新出新的菜单
        this.getMenus()
        // 设置需要默认展开的菜单
        this.expandedKey = [this.category.parentId]
      })
    },

    remove (node, data) {
      console.log(data)
      console.log(node)
      var ids = [data.id]
      this.$confirm(`是否删除【${data.name}】菜单?`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl('/product/category/delete'),
            method: 'post',
            data: this.$http.adornData(ids, false)
          }).then(({ data }) => {
            console.log(data)
            if (data.msg === 'error') {
              this.$message({
                message: '该分类被引用',
                type: 'error'
              })
            } else {
              this.$message({
                message: '菜单删除成功',
                type: 'success'
              })
            }
            // 刷新出新的菜单
            this.getMenus()
            // 设置需要默认展开的菜单
            this.expandedKey = [node.parent.data.id]
          })
        })
        .catch(() => {})

      console.log('remove', node, data)
    }
  },
  created () {
    this.getMenus()
  }
}
</script>
<style scoped>
</style>